Operation and Maintenance
Operational
Modes
AUTOLOADER LTO3 – User Reference Manual Rev. 1.01
TANDBERG DATA
Page 3 4 of 79
8.4.3 Sequential Mode
In Sequential Mode the Media Exchanger is no longer visible on t he SCSI bus. Cartridge
replacements are initiated by an ‘Unload’ command sent to the drive.
Sequential Mode presumes that the first cartridge was previously loaded to the drive, i.e. the operator
determines the first cartridge to load by loading the desired cartridge into the drive using the ‘Load
Cartridge’ menu item on the OCP. When the first tape is unloaded with a drive ‘Unload’ command, the
autoloader removes the cartridge from the drive and puts it in its original slot. After that, the next
cartridge in order will be moved into the drive. This queue stops if the last cartridge has been ejected
und unloaded to the slot.
NOTE:
If Sequential Mode is activated (menu item CONFIGURATION/CHANGE LDR
MODE/TO:SEQUENTIAL), the media exchanger is not logically connected the SCSI bus
and does not respond to SCSI commands. Every SCSI command (except INQUIRY and
REQUEST SENSE) sent to the media exchanger is rejected with a Check Condition (sense
key 02/04/8E). For further details please see the Media Exchanger SCSI Command
Specification.
In Sequential Mode the display shows the following screen where the string ‘SEQ’ indicates that
Sequential Mode is activated:
Drive empty
12345-78 SEQ
To further determine how you want cartridges loaded into the drive while in Sequential Mode, you can
set Loop Mode and Autoload Mode from the OCP.
8.4.4 Loop Mode
Loop Mode is a special type of Sequential Mode. The cartridges exchange queue will not terminate
with the last cartridge but restart with the first cartridge. This mode allows endless backup operation
without user interaction.
8.4.5 Autoload Mode
This is also an option of Sequential Mode and could be combined with Loop Mode. The first cartridge
will be loaded automatically if the unit powers up with an empty drive. In this case user interaction via
OCP is not required.
